Gas-check pad for breech-loading ordnance.



G. GBRDOM. CHECK PAY FR BREF. ri LGADG ORDN'ANGE.

APPLIQATO' FILED IDEC. 2'?. 1902.

N0 MODEL. 2 SHEETS-SHEET l'.

@y All@ Hor., 732,541.

PATENTED JUNE 30, 1903.

G. GERDOM. GS CHECK PAD FOR BREEGH LOADNG ORDNANCE.

APPLICATION FILED DE()x 27, 1902.

2 SHEETS-Smm 2.

UO MODEL.

- UNITED STATES Patented June 30, 1903.

PATENT EEICE. A

` GREGORY GERDOM, OF WATERVLIET, NEW YORK, AssIGNOR 'ro ORDNANOE'IMPROVEMENT COMPANY, A CORPORATION or NEW YORK; y

eAs-cHEcK PAD FOR Bassora-LOADING omznuluqc4 SPEQIFICATION forming partof Letters Patent N o. 732,541, dated June 30, 1903.

Application filed December 27.v 1902. vSerial No. 136.770. (No model i yTo all whom it kTn/ow/ concern.-

Be it known that I, GREGORY GERDM, of Va-tervliet, Albany county, NewYork, have invented a new and useful Gas-Check Pad for Breech-LoadingOrdnance, of which the.

following is a specification.

My invention relates to improvements in gas-cl1eek pads forbreech-loadin g ordnance, its object being to provide a pad which willbe practically unaffected by extreme ranges of temperature and alsowhich cannot be' burned or otherwise injured by contact with thepowder-gases.

To this end my ,invention consists in the` improved plastic compositionadapted to con# stitute the body of the pad and in the envelop therefor,both as hereinafter particularly de-` scribed and claimed. l

The type of gas-check for which luy-invention is adapted is known as theDe Bange, in which the pad is seated upon the forward end of thebreech-block and a mushroom head bears upon the pad and has a stemextending through an axial opening in Vthey pad and In the service useof guns iittedfw'ith the above-described type of gas-check it has 'beenfound that the canvas envelop or covering for Y the pad' is permanentlyinjured or destroyed in case -of slight leakage of gas which comes intocontact with it. Itis also found that the composition heretofore used insuch pads by extreme cold is rendered too rigid for its designedfunctionand that repeated firings of a gun will raise the temperature ofthe chamber and of the pad to such a degree that the com-A position isreduced to such soft condition that it fails to retain its normal shapeand seriously interferes with the action of the breechblock. My improvedcomposition, however, is practicallynnaffected by the extreme maximumrand minimum temperatures to which it is subjected in service. f-

Myimproved pad envelop or covering, while perfectly iexible, so as toyield to pressures modifying the lform of the pad, is wholly unaiectedby the hot gases which may leak into con tact with it. The compositionfor the core consists of the following ingredients comd pounded vinsubstantially the followingv proportions and manner: Take about-fourparts, by measure, of glycerin, with one part, by measure, of starch,mix and cook until reduced to a stiff paste and then add two parts, bymeasure, of tallow or li-nseed orothersuitable oil and mix thoroughlywhilehot.'` The mass should then be allowed to stand for sev-t,

eral days. .j This paste is thenmixed with asbestos in about thefollowing proportionsviz., twenty to thirty per cent of paste Iwith.eighty to seventy per cent of asbestos. This is thoroughly mixed andshould be allowed to stand under pressure for several days, after whichit is ready for molding into pads. The

pad so molded is covered with the wire en velop inthe manner hereinafterdescribed.

In the accompanying drawings, forming part of this specification, Figure1 represents a sectional sideelevation of my improved pad before it issubjected to final pressure. Fig. 2 is a plan view of the pad complete,show ing .the interlocking and uniting edges of the covering. Fig. 3 isa side orv edge elevation of the complete pad, a portion-being brokenaway to show theembedding of the wires of the covering in the mass ofthecore under final pressure. Fig. 4 is an enlarged detail of apiece of thewire-netting used for the covering. Fig. is a similar'view ofthe samedistorted, as when applied to the core; and Fig. 6 is a detail showingthe interlocked edges of the netting as it is secured in place. y

' In the drawings, A represents the core of plastic material, and B itsenvelop of wirenetting. The general form of the core, as is wellunderstood, is annular and' properly shaped to lit its seat upon the endof the breech-block. and the mushroom head which `bears upon itsopposite face; The composition hereinbefore described having beenmolded' into the proper form is covered '-by the wirenetting B in thefollowing manner A piece of the netting, being distorted, as indicatedin Fig. 5, in the direction of the plane of the pad, is folded aroundthe outer periphery of the core andthe meeting ends are'interlocked bypassing the wire ends 2 around the wire 3 of -the opposite sclvage edgeand bending them L -Wires by solder.

`two pieces of fabric are then secured together,

s shown in Fi'gs. l, 2, and 3, by laying an an- 'nular piece 0f asbestosor oth er non-conductor underneath the same and then uniting the Afterthe pad has thus been :completed it Ais subjected to heavy pressure,which forces the Wires into the mass of the core or, conversely, themass of the core out 'between the vWires, so that the wires arecompletely embedded therein and a smooth surface is presented to theadjacent parts of the gun, as shown inA Fig;V 3.' The envelp is free Vtoyield to Athe pressures which modify the for-m of the pad, whileretaining the contents, and is unaffected by a leakage of hot gases,which would burn and cut a combustible 'envelep After the pad isfinished it should. be vsubjected for about one hour to a heat of about300 Fahrenheit and after cool- 4Aing should be given one or more coatsof linseed-oil. After drying the pad should be returned to the press forfinal pressure andl shaping;

I claiml. A gas-check pad, comprising a plastic core having a metalliccloth envelop.

2. A gas-check pad comprising a plastic core and a Wire-cloth envelopconstructed substantially as specified.

A gas-check pad having a plastic-core, and a Wire-cloth envelop formedby folding sections of cloth upon the core and uniting the overlappingedges with solder.

4. A gas-check pad comprisin gin combination a iiexible envelop and aplastic core composed of asbestos, a suitable grease, glycerin andstarch combined substantially in the proportions and manner specied.

5. A gas-check pad comprising in combin'ation, a iiexible Wire-clothenvelop and a plastic core composed of,asbestos, a suitable grease.,glycerin and starch, constructed and combined substantially asspecified.

Signed at New York city this 19th day of December, 1902.

GREGORY GERDOM.

Vitnesses:

T..D. MERWIN, '.l. T. CRANE.

